Time Gentlemen, Please
is the sequel to the 2008 Award-Winning Adventure/Comedy Ben There, Dan That!
The main characters have found out that their future selves are evil, and have set about a series of events that wipes out all human life on the planet. So they go back in time to fix things with half a mind on preventing the invention of coathangers, and accidentally setting up an alternate-universe Hitler with an unstoppable army of dinosaur clones! Whoopsie!